MAXTRYLOCK
Maximum number of iterations to wait for locks on global variables before declaring possible deadlock and skipping the probe, default 1000.

MAXACTION
Maximum number of statements to execute during any single probe hit (with interrupts disabled), default 1000.

MAXACTION_INTERRUPTIBLE
Maximum number of statements to execute during any single probe hit which is executed with interrupts enabled (such as begin/end probes),
default (MAXACTION * 10).

MAXMAPENTRIES
Maximum number of rows in any single global array, default 2048.

MAXERRORS
Maximum number of soft errors before an exit is triggered, default 0, which means that the first error will exit the script.

MAXSKIPPED
Maximum number of skipped probes before an exit is triggered, default 100. Running systemtap with -t (timing) mode gives more details about
skipped probes. With the default -DINTERRUPTIBLE=1 setting, probes skipped due to reentrancy are not accumulated against this limit.

MINSTACKSPACE
Minimum number of free kernel stack bytes required in order to run a probe handler, default 1024. This number should be large enough for
the probe handler’s own needs, plus a safety margin.

MAXUPROBES
Maximum number of concurrently armed user-space probes (uprobes), default somewhat larger than the number of user-space probe points named
in the script. This pool needs to be potentialy large because individual uprobe objects (about 64 bytes each) are allocated for each
process for each matching script-level probe.
STP_MAXMEMORY
Maximum amount of memory (in kilobytes) that the systemtap module should use, default unlimited. The memory size includes the size of the
module itself, plus any additional allocations. This only tracks direct allocations by the systemtap runtime. This does not track indirect
allocations (as done by kprobes/uprobes/etc. internals).

TASK_FINDER_VMA_ENTRY_ITEMS
Maximum number of VMA pages that will be tracked at runtime. This might get exhausted for system wide probes inspecting shared library vari‐
ables and/or user backtraces. Defaults to 1536.

STP_PROCFS_BUFSIZE
Size of procfs probe read buffers (in bytes). Defaults to MAXSTRINGLEN. This value can be overridden on a per-procfs file basis using the
procfs read probe .maxsize(MAXSIZE) parameter.